Anchor for contour amalgam fillings.



No. 880,888, PATENTED MAR. 8, 1908.

v r. LINNBRT.

ANCHOR FOR CONTOUR AMALGAM FILLINGS.

APPLICATION FILED NOV. 29, 1907.

FRANK W. L INNERT, OF WARRENTON, M;ISSOURI.

ANCHOR FOR CONTOUR AMALGAIVI FILLINGS.

Specification of Letters Patent.

Patented March 3,- 1908.

Application filed November 29, 1907. Serial No. 404,416.

T 0 all whom it may concern:

Be it known that I, FRANK W. LINNERT, a citizen of the United States, and resident of \Narrenton, Warren county, Missouri, have invented certain new and useful Improvements in Anchors for Contour Amalgam Fillings, of which the following is a speoification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to an anchor for contour amalgam fillings, my object being to construct a simple anchor which is used in amalgam fillings, and which anchor is intended to prevent the splitting of the filling at its neck, or narrowest portion, which splitting is due to excessive stress of mastication on the filling.

To the above purposes, my invention consists in certain novel features of construction and arrangement of parts, which will be hereinafter more fully set forth, pointed out in the claims, and illustrated in the accompanying drawings, in which Figure 1 is a perspective view of an anchor of my improved construction; Fig. 2 is a perspective view of a molar tooth having a caV- ity which is partially filled with amalgam, and showing my improved anchor partially embedded in the amalgam; Fig.3 is an elevation of the tooth seen in Fig. 2, with the upper portion of the tooth shown in section, and showing the filling completed Fig. 4 is a plan view of a molar tooth having a compound cavity, with the matrix in position on the tooth, and with my improved anchor positioned in the cavity; Fig. 5 is a perspective view of a modified form of the anchor.

Referring by numerals to the accompanying drawings :1 designates the main body of the anchor, which is in the form of a straight shank provided on one end with an integral head 2, and its opposite end with an integral arm 3, which is approximately disposed at right angles to the shank 1, and which may be slightly curved if desired.

To use the anchor so constructed, the proper cavity is prepared in the tooth, after which the matrix A is positioned in the usual manner around the tooth and cavity therein, and said cavity is partially filled with amalgam. The anchor is now positioned on top of the partial filling, with the head 2 in the smaller portion of the cavity, and with the arm 3 longitudinally disposed in the larger portion of the cavity. Amalgam is now placed on top of the first filling in sufiicient quantity to fill the cavity, thus embedding the anchor in the center of the complete filling, after which said filling is allowed to harden, and is then finished in the usual manher. The anchor embedded in the center of the filling very effectually prevents the split ting of the filling at its narrowest portion, or between the two portions of the cavity, which splitting is a very frequent occurrence where anchors are not utilized.

In Fig. 5 I have shown an anchor with an enlargement on each end of the arm 3, and which construction tends to prevent the transverse splitting of the filling in the larger portion of the cavity.

The anchors may be in varying sizes to fit in different cavities, and may be constructed of any suitable material.

I claim 1. An anchor for amalgam fillings, comprising a shank, a head integral with one end thereof, and an arm rigidly fixed at its center to the opposite end of the shank.

2. An anchor for amalgam fillings, com prising a shank, a head integral with one end thereof, an arm rigidly fixed at its center to the opposite end of the shank, and heads formed on the ends of said arm.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

FRANK WV. LINNERT.

Witnesses JOHN J. SonArER, JOHN ,BARTEIOLOMAEUS. 

